specifications coffee pulper

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PHILIPPINE AGRICULTURAL ENGINEERING STANDARD PAES 252:2011Agricultural Machinery – Coffee Pulper – Specifications for circulation Foreword The formulation of this national standard was initiated by the Agricultural Machinery Testing and Evaluation Center (AMTEC) through the project “Development of Standards for Agricultural Production and Postharvest Machinery” funded by the Philippine Council for Agriculture, Forestry and Natural Resources Research and Development – Department of Science and Technology (PCARRD – DOST) This standard has been technically prepared in accordance with BPS Directives Part 3:2003 – Rules for the Structure and Drafting of International Standards. The word “shall” is used to indicate mandatory requirements to conform to the standard. The word “should” is used to indicate that among several possibilities one is recommended as particularly suitable without mentioning or excluding others. In the preparation of this standard, the following documents/publications were considered: Coffee pulpers.http://www.alvanblanch.co.uk/coffee%20Pulper%20.pdf.<accessed on June 01, 2009>

Gersona coffee pulper.http://mrdcsagada.blogspot.com/2008/02/mrdc-products.html.<accessed on June 01, 2009>

Pulper cum washer for coffee.http://www.tnau.ac.in/tech/implements/proc11.htm. <accessed on June 01, 2009>

Small scale processing of coffee.http://www.mixph.com/2009/02/small-scale-processing-of-coffee.html.<accessed on June 01, 2009>

Damil Engineers Pvt. Ltd..http://www.damilengineers.com/french/e-brochure.pdf.<accessed on June 01, 2009>

Potential and future of wet coffee processing in eastern africa.http://www.ratescenter.org/pdf/Coffee/Ulf%20Kusserow%20-%20Ecologic%20Wet%20Proces.pdf.<accessed on June 01, 2009>

Garcia, Lawrence Dean Basisto. Testing and evaluation of the CvSU coffee pulper based on the formulated standard specifications and methods of test. Undergraduate Thesis. Agricultural Machinery Division, Institute of Agricultural Engineering, College of Engineering and Agro-Industrial Technology, University of the Philippines Los Baños. April 2007

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PHILIPPINE AGRICULTURAL ENGINEERING STANDARD PAES 252:2011Agricultural Machinery – Coffee Pulper – Specifications for circulation 1 Scope This standard specifies the manufacturing and performance requirements for coffee pulper. 2 References The following normative documents contain provisions, which, through reference in this text, constitute provisions of this National Standard: AWS D1.1:2000 Structural Welding Code - Steel PAES 102:2000 Agricultural Machinery – Operator’s Manual – Content and

Presentation PAES 103:2000 Agricultural Machinery – Method of Sampling PAES 311:2001 Engineering Materials - Screws for Agricultural Machines –

Specifications and Applications PAES 313:2001 Engineering Materials – Bolts and Nuts for Agricultural

Machines – Specifications and Applications PAES 253:2009 Agricultural Machinery – Coffee Pulper – Methods of Test 3 Definitions For the purpose of this standard the following definitions shall apply: 3.1 coffee pulper machine to remove and separate the soft pulp of ripe coffee cherry without making any damage to the parchment coffee 3.2 coffee cherry ripened fruits of coffee shrubs (see Figure 1)

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Figure 1. Parts of coffee cherry (cross-section) 3.3 flute thread like component of rotating cylinder of the pulping chamber 3.4 flute inclination angle of inclination of the rubber coated flutes 3.5 input capacity weight of coffee cherry fed into the pulper per unit of time, expressed in kilogram per hour 3.6 output capacity weight of parchment coffee collected at coffee outlet per unit time, expressed in kilogram per hour 3.7 pulping process of removing and separating the skin and pulp of coffee cherry

Skin

Pulp

Parchment

Silverskin

Bean

Stalk

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3.8 mucilage slimy layer found between the pulp and adhering to the parchment 3.9 parchment endocarp of the coffee cherry, lies between the fleshy part (or pulp) of the cherry and coffee bean 3.10 parchment coffee final output product when the coffee cherry has undergone pulping process 3.11 main parchment coffee outlet part of machine where parchment coffee are collected 3.12 pulp outlet part of machine where pulps are collected 3.13 pulp red or green thin fleshy outer layer of the coffee cherry 3.14 pulping efficiency ratio of total weight of parchment coffee collected at all outlets to the total coffee cherry input to the machine, expressed in percentage 3.15 pulping recovery ratio between the total weight of parchment coffee collected at the main outlet to the total weight of input coffee cherry to the machine, expressed in percentage 3.16 separation loss ratio of the total weight of the parchment coffee that comes out to the pulp outlet to the total input weight of coffee cherry to the pulper, expressed in percentage 3.17 unpulped loss ratio of the total weight of unpulped coffee cherry to the total input weight of coffee cherry to the pulper, expressed in percentage

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3.18 scattering loss ratio of the total weight of the parchment coffee that fell around the base of coffee pulper to the total coffee cherry input to the machine, expressed in percentage 3.19 mechanically damaged parchment coffee ratio of the total weight of damaged parchment coffee to the total weight of sample, expressed in percentage 4 Classification The classification of coffee pulper shall be based according to the following: 4.1 Pulping mechanism

4.1.1 Disc pulper (Figure 2a and 2b) Pulper that uses rubbing action of disc bulbs and chop rails to remove the pulp from parchment coffee.

Figure 2a. Disc Pulper

Disc bulbs

Chop rail

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Figure 2b. Schematic diagram of disc pulper

Disc pulper shall be classified according to power source:

4.1.1.1 Mechanically operated (Figure 3)

Figure 3. Motor-driven disc pulper

Rotating discChop rails

Cherry Cherry

Chop rails

Troughs

Pulps

Parchment coffee

Parchment coffee outlet

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4.1.1.2 Manually operated (see Figure 4)

Figure 4. Manually operated disc pulper


Hopper

Pulper disc


Rotating spindle

Handle

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4.1.2 Drum pulper (Figure 5)

Pulper that uses a rotating cylinder with flutes inside a fixed pressed plate with pulping channels and ribs.

Figure 5. Drum Pulper

Cherries

Rotating cylinder with flutes

Pressed cover

Parchment coffee

Pulp

Receiving troughs

Separating plates

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Drum pulper shall be classified according to: 4.1.2.1 Power Source (Figure 6)

4.1.2.1.1 Mechanically operated

Figure 6. Motor-driven coffee drum pulper

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4.1.2.1.2 Manually operated (Figure 7)

Figure 7. Manually operated drum pulper

4.1.3 Fluted Cylinder Pulper that uses rotating cylinder with flutes or threads. Fluted cylinder pulper shall be classified according flute inclination. 4.1.3.1 43° Flute inclination (Figure 8)

Figure 8. Pulping cylinder with 43° flute inclination

Flutes

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4.1.3.2 50° Flute inclination (Figure 9)


4.1.3.3 60° Flute inclination (Figure 10)


4.1.4 Slotted plate pulper (Figure 11 and 12) Pulper machine that uses a fixed slotted metal screen and a rotating cylinder that serves as the pulping chamber.

Figure 11. Slotted plate coffee pulper

Slotted plate

Receiving trough

Flutes

Flutes

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Figure 12. Schematic diagram of slotted plate coffee pulper 4.2 Mode of Feeding

4.2.1 Dry feeding Coffee cherry are fed into the hopper of the coffee pulper without using water 4.2.2 Wet feeding

Coffee cherry are fed into the hopper of the coffee pulper using water

Slots

Rotating cylinder

Slotted plate

Cherry

Trough for parchment

coffee Trough

for pulps

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5 Manufacturing Requirements 5.1 Steel bars, metal sheet or plate and heavy-duty mild steel shall be generally

used for the manufacture of the different components of the coffee pulper. Parts that are in direct contact to the parchment coffee and coffee cherry shall be made of non-corrosive and food grade materials.

5.2 Pulping mechanisms/pulping chamber shall be made of food grade and non-corrosive materials (e.g. stainless steel grade 304)

5.3 Clearance between the rotating disc or cylinder and the fixed cover shall be adjustable. It shall be gradually decreasing in size.

5.4 For wet feeding hopper, inlet for the intake water shall be provided to avoid clogging of pulp and beans during operation.

5.5 Water-pulp-parchment conveyor (if available) shall be designed to oscillate to avoid pulp and parchment to get stocked on the conveyor.

5.6 Frame and stand shall be able to support the whole coffee pulper assembly

during operation 5.7 Main parchment coffee outlet shall be made of food grade and non-corrosive

materials (e.g. stainless steel grade 316).

5.8 Maximum speed for the shaft of the mechanized coffee pulper shall be 120 rpm.

5.9 Maximum speed for the shaft of the manual coffee pulper shall be 60 rpm.

5.10 Bolts and screws to be used shall conform to the requirements of PAES 311 and 313.

5.11 Sizes of the parts of the coffee pulper shall conform to the manufacturer’s specifications.

6 Performance Requirements The coffee pulper when tested in accordance with PAES 253 shall conform to the following requirements: 6.1 Input and output capacity shall meet the specifications of the manufacturer.

6.2 The performance criteria for coffee pulper shall be as specified in Table 1.

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Table 1. Performance Criteria for Coffee Pulper

Criteria Performance Data Pulping Recovery, percent, minimum 93.5 Pulping Efficiency, percent, minimum 95.0 Losses, percent, maximum

a) Separation Loss b) Unpulped Loss c) Scattering Loss

1.0 5.0 0.5

Purity, percent, minimum 98 Mechanically damaged parchment coffee, percent, maximum

3.5

Noise Level, [dB(A)], maximum 92.0* * Allowable noise level for six (6) hours of continuous exposure based on Occupational Safety and

Health Standards, Ministry of Labor, Philippines.1983 7 Safety, Workmanship and Finish 7.1 The base of coffee pulper shall be rigid and its rotating components shall be

statically and dynamically balanced. 7.2 The coffee pulper shall be free from manufacturing defects.

7.3 Pulping mechanism shall be adjustable and replaceable. 7.4 All surfaces that are not in direct contact with products shall be free from rust

and shall be coated with a suitable paint material.

7.5 The external part of the coffee pulper shall be free from sharp edges and rough surfaces.

7.6 Belt cover or guard shall be provided

7.7 There shall be provision for belt tightening and adjustments. 7.8 Mechanism for immediate load disengagement between prime mover and

coffee pulper shall be provided. 7.9 All welded parts shall be water-tight and smoothly polished and it shall pass

visual inspection criteria (AWS D1.1:2000) for discontinuity of materials.

7.10 Welded joints shall not be less than 4 mm (1/8 inch) side fillet welded. Undercut shall not exceed 2 mm (1/16 inch) for any length of weld.

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8 Warranty for Fabrication and Durability 8.1 Warranty against defective materials and workmanship shall be provided for

parts and services except for normal wear and tear of consumable maintenance parts such as belts within six months from the date of purchase.

8.2 The construction shall be rigid and durable without breakdown of its major

components for at least six months from the date of purchase. 9 Maintenance and Operation 9.1 Each coffee pulper unit shall be provided with a set of standard tools

prescribed by the manufacturer.

9.2 An operator’s manual which conform to PAES 102, shall be provided. 9.3 The coffee pulper shall be easy to clean and operate.

10 Testing Coffee pulper shall be tested in accordance with PAES 253. 11 Marking 11.1 Each coffee pulper shall be marked in English with the following information

using a stencil or by directly punching it on a plate and shall be positioned at a most conspicuous place:

11.1.1 Registered trademark of the fabricator 11.1.2 Brand 11.1.3 Model 11.1.4 Serial number 11.1.5 Input capacity, kg/h 11.1.6 Recommended pulping speed, rpm

11.1.7 Power requirement, kW 11.1.8 Name and address of the fabricator 11.1.9 Name and address of the importer, if imported

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11.1.10 Country of manufacture (if imported) / “Made in the Philippines” (if manufactured in the Philippines)

11.2 Appropriate safety precautions shall be provided. Marking shall be stated in

English and Filipino and shall be printed in red color with a white background. 11.3 The markings shall have a durable bond with the base surface material. 11.4 The markings shall be all weather resistant and under normal cleaning

procedures, it shall not fade, discolor, crack or blister and shall remain legible.

specifications coffee pulper

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